Method and system for calibrating a quadrature phase modulator

Details Method and system for calibrating a quadrature phase modulator Method and system for calibrating a quadrature phase modulator

1997-03-10

1998-12-08

Grimm, Siegfried H.

Modulators

Phase shift keying modulator or quadrature amplitude modulator

332123, 332159, 375296, H04L 2736

Patent

active

058476199

ABSTRACT:
A calibration system for calibrating a quadrature phase modulator comprises a signal generator for generating a pair of sine-wave signals which are quadrature in phase, an adjusting section for adjusting the amplitude and phase of the pair of sine-wave signals, a DC voltage offset block for adjusting the DC level of the pair of sine-wave signals, and a frequency spectrum analyzer for monitoring the output of the quadrature phase modulator. The output spectrum of the quadrature phase modulator includes three maximal points, two of which are caused by amplitude error, phase error and carrier leakage and minimized by consecutive adjustment in the adjusting block to calibrate the quadrature phase modulator.

REFERENCES:
patent: 4717894 (1988-01-01), Edwards et al.
patent: 5119399 (1992-06-01), Santos et al.
patent: 5355101 (1994-10-01), Ichihara et al.
patent: 5396196 (1995-03-01), Blodgett
patent: 5491832 (1996-02-01), Malkamaki et al.

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